Hi Smallville,
I gather from your post that you've been through some very difficult months. I am glad you are feeling better now though

Could you perhaps tell us a bit more about what you've been through in those 9 months that you stayed with your SIL?
You mention having decided to cut ties with her until she gets the help she needs. Are you now completely NC with your SIL? And do you feel like your SIL in any way acknowledges that there might be something wrong with her behavior and/or that she might need help?